Here is something that showed up in some searches that might be relevant to the Hardy Varvel mystery. http://trees.ancestry.com/tree/8284318/person/-788278252
This tree shows Susan Hardy as a half sibling to a Jefferson Varvell who was born in 1838. You have to use the family member button.
My skills aren't enough to make sense of this yet.
And don't have any concrete plans to travel to Missouri yet, if I can ever pull that off.